Bears sign DE Yannick Ngakoue.

Guys, just look at the market.  It gives you the answer.

YN is a young, established quality edge rusher who doesn't have any significant injury or off-field concerns.  We all know how coveted those are in the modern NFL game which is pass-oriented.

Why the hell was a guy like that still on the open market in August and settling for a one-year deal?

The answer is obvious.  If he wasn't a liability against the run he would have be signed to a more lucrative deal back in March.